Ophthalmoscope.



No. 679,044. Patented July 23, 190|. l

' H. L. DE ZENG.

OPTH'ALMUSC'UPE.

(Application mea Apr. 29, 1901.)

(No Model.)

TH: Noam: PETERS cu. PuomLny'wo.. wsnmavou. n. c.

UNITED STATES PATENT OEEicE.

HENRY LAWRENCE DE ZENG, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO A. M. DE ZENG, OF SAME PLACE, AND WALTER H. CHAMBERLIN, OF CHICAGO, ILLINOIS.

o'PHTHALMoscoPE.

SPECIFICATION forming part of Letters Patent N0. 679,044, dated July 23, 1901.

Application filed April 29, 1901.

T all whom it may concern.:

Be it known that I, HENRY LAWRENCE DE ZENG, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Ophthalmoscopes, of which the following is a specification.

My invention consists of a novel construction of an ophthalmoscope which is adapted for viewing, magnifying, and photographing the interior of the eye and measuring its refraction by means of telescopic attachments or other similar or equivalent devices.

To the above ends my invention consists of a suitable body having a reflector supported on one side thereof and a telescope supported on the opposite side thereof.

' It also consists in the novel combination of a supporting-body to which the main tube of the telescope is attached, said main tube having a pin therein which is adapted to engage the walls of a spiral groove in the rotatable or adjustable sleeve of the eyepiece carried by said tube.

It also consists of the novel'construction of an eyepiece having a graduated scale thereon for determining the relative positions of the eyepiece and the objective.

It further consists of novel details of construction, all as will be hereinafter set forth, and particularly pointed out in the claims.

Figure 1 represents a perspective view of an ophthalmoscope embodying my invention. Fig. 2 represents a vertical sectional view of Fig. 1. Fig. 3 represents a side elevation of the telescope employed in detached position. Fig.4represents another view of areector and supporting device therefor which may be employed, if desired. Fig. 5 represents a sectional view of a ball or socket attachment between the telescope or body and mirror.

Similar numerals of reference indicate corresponding parts in the figures.

Referring to the drawings, 1 designates an ophthalmoscope, the same consisting of the body 2, at one side of which is secured by any suitable means the telescope 3, the same consisting of the tube 4, which carries the pin 6, attached thereto, said pin being adapted to So engage the walls of the spiral groove 7 in the Serial No. 57,901. (No model.)

eyepiece or sleeve 8, the latter being rotatably or adjustably mounted upon the main tube 4 and having the milled focusing-disk or steadying-support 9, wit-hin which is coutained the eye-lens 10. On the tube 4 is a suitable mark 4u and on the tube 8 suitable graduations 8, whereby the rotation of the parts 8 and 4 with respect to each other, and consequently the relative separation of the lenses 10 and 5, may be accuratelyindicated. By adjusting the lenses so that when observing an emmetropic eye the zero-mark on the scale 8fL registers with the mark 4 and when the observed eye is ametropic the graduations on either side of the zero-mark will indicate the amount and nature of the ametropia. The body 2 is provided with an opening 11 in front of the objective 5, which is in alinement with the opening 12 in the reflector 13, which latter in the present instance is mount ed upon the supporting-case 14, which latter is adjustably mounted in the upper and lower bearings 15 and 16, respectively, by means of the journals 17 and 1S. The body 2 is supported upon the stem 19, which is attached 75 to the handle 20, whereby the ophthalmoscope can be conveniently manipulated.

In the modification seen in Fig. 4 I have shown the main tube 4 of the telescope provided with the objective 5, as already de- 8o scribed, and the body 2 having an opening 11 therein, which is in alinement with the opening 21 of the plate 22, which has a cylinder or shell 23 attached thereto, whereby the reflector 24 is carried. It will be noted that said 85 reiector 24 is rotatably supported in an inclined position, the plate 22 being supported Vby means of the channel or recesses 25, attached to the body 2, or other suitable sustaining devices may be employed, if desired.

In the construction seen in Fig. 5 I have shown the main tube 4 of the telescope as provided with the objective 5, as already described, and another formof reector 26, adj ustably mounted uponV said mainv tube by 9 5 means of the ball-and-socket connection 27, whereby the plane of the reiiector 26 can be universally adj usted in relation to the optical axis of the telescope, orvice versa.

It will be apparent that the main tube 4 can Ioo be attached to or supported by the body 2 by any suitable means, although I have shown these parts in the present instance as in threaded engagement. It will also be apparent that the reiiectors 13, 24, and 2G can be supported with relation to the main tube 4: or to the telescope by other devices Without departing from the spirit of my invention.

The desired adjustments oi the relation of the eyepiece l() with respect to the objective 5 can be eected by other means than that described, as will be apparent to those skilled in the art.

The objectivedens can be either` a simple or an achromatic system, according to requirements, and the eye-lens l0 can also be a simple or an achromatic system, as desired.

Vtfhen it is desired to use my invention in connection with a photographic apparatus, the eyepiece may be removed and a camera substituted, as is evident.

If desired, the principle of the ball-andsocket adjustment seen in Fig. 5 can be applied to the constructions seen in Figs. 2 and 4, said ball-and-socket connection being in front of or behind the body 2, as desired or expedient.

Although I have shown perforated concave reflectors, I do not desire to be limited thereto in every instance, as it will be evident that I may employ a plane or concave reiector having no perforation therein and no coating of quicksilver or other material on the back thereof, the essential feature being to have a reflector in combinationv With a telescope, which reflector will direct the illuminating or extraneous rays of light into the eye, and a suitable opening in the reflector whereby the rays of light from the observed eye may pass back through the re (lector into the telescope.

When a coated reflector is used, I may employ either an opening therein or the coating may be removed at a point in alinement With the optical axis of the telescope.

It will be evident that my invention can be adapted and applied to the various forms of ophthalmoscopes now in use.

It will be apparent that objectives 5 of different povrer can be used in connection with the eye-lens 10, and vice versa, in accordance with requirements. It will be evident that suitable eyepieces may be used for producing upright images when required and that other changes may bemade by those skilled in the art, and Ivdo not therefore desire to be limited in every instance to the exact construction I have herein shown and described'.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In combination, a telescope and au ophthalmoscope havinga reflector for extraneous light and means permitting the transmission ofk light from the object through said reiiector, substantially as described.

2. In combination, a telescope and an'ophthalmoscope having a reflector, the latter having an openingin its reflecting-surface in line with the telescope.

3. In combination, a telescope andan ophthalmoscope having an adjustable reiector for extraneous light and means permitting the transmission of light from the object through said reflector.

4. In combination, an adjustable telescope and an ophthalmoscope having an adjustable reflector for extraneous light and means permitting the transmission of light from the object through said reiiector.

5. In combination, a telescope, the lenses of which are relatively adjustable, means for measuring said adjustment, and an ophthalmoscope.

6. In combination, a telescope and an ophthalmoscope having a reflector for extraneous light, said reflector supported by a universal joint, and means permitting the transmission of light from the object through said re- Elector.

HENRY LAWRENCE DE ZENG.

Witnesses:

E. HAYWARD FAIRBANKS, C. D. MCVAY. 

